Doctor or scraper for cleaning the surfaces of cylinders, rolls, and the like.



J.NUTTALL. I DOCTOR 0R SGRAPBRFOR CLEANING THE SURFACES OF CYLINDERS, ROLLS, AND THE LIKE.

APPLICATION FILED AUG. 5,1913.

1 992,798. Patented Apr. 7, 1914 Fig: 5.

. wvsmr l? N [Tr/5 555 T WWW Q g; 7 JW M JAMES NUT'I'ALL, 0F BURY, ENGLAND.

DOCTOR OB SCRAPER FOR CLEANING- IHE SURFACES 0F CYLINDEM, ROLLS, AND THE LIKE.

Specification of Letters Patent.

Patented Apr. "3, 191%.

Application filed August 5, 1913. Serial No. 783,183.

To all whom it may concern:

Be it known that I, JAMES NUTIALL, a

subject of the King of Great Britain and,

and. the like, of which the following is a Specification.

This invention relates to improvements in doctors, or scrapers, for cleaning the surfaces of cylinders, rolls and the like (which I will hereinafter refer to as cylinders) and has for its object to provide a rigid doctor, or scraper, which will have a very ellicient cleaning efliect, be self-sharpening and always retain. .a keen cutting, or scraping edge in use.

The present device may be properly used with printing cylinders or as a scraper for removing substances from cylinders of other nature and I do not limit my invention to its use with any particular type of cylinder.

1 will describe my invention with refer ence to the accompanying drawing in which-higure 1, is a side elevation, Fig. 2 a plan, and Fig. 3 a front elevation ofone form of doctor, or scraper, according to my invention.

According to my inventionl make the doctor, or scraper, 1, with the cutting, or scraping, edge, 2, continuous but formed so that portions 5 thereof act upon the cylinder in different longitudinal lines parallel with the axis of the cylinder, and so that parts 4 which join the said portions also act upon the said cylinder.

My improved doctor, or scraper, 1, is made of metal, or other suitable material, and may be formed with grooves 3 therein, which are at right angles, or other suitable angle, to the axis of the cylinder, these grooves being preferably larger at the top than at the bottom, or vice versa, and being formed on one, or both sides, of the doctor, or scraper, and having any desired depth and shape.

In the accolnpanyipg drawing grooves 3 are shown formed in both sidesv of the doctor, or scraper 1.

The edge 2 of the doctor, or scraper, thus formed, being beveled, or out or cast, on an incline, as shown in Fig. 1, will, when pressed against the surfaceof the cylinder, present thereto portions 5 which act upon the cylinder in difi'erent longitudinal lines ,parallel with the axis of the cylinder and parts eiwhich also act upon the cylinder.

The parts 4: of the edge 2 of the doctor, or scraper 1, which join the portions 5 are preferably inclined to the direction of rotation of the cylinder as shown more clearly in Fig. 2 of the accompanying drawing so as to have a shearing action, which will be increased if the doctor, or scraper, be caused to have a reciprocating motion across the surface of the cylinder, parallel with its axis, the doctor, or scraper being thus reciprocated by any suitable reversing mechanlsm.

I wish it to be particularly understood that I do not limit myself to the precise formations of doctor, or scraper, shown in the accompanying drawing as it is obvious that modifications in the formation can be made without departing from thespirit and scope-of the invention.

The doctor or scraper may be made of anv suitable metal or alloy which should be sui ficiently hard to always retain a keen cut ting or scraping edge when in use as the wear on the bearing surface continues.

In the following claims the term cylinder is to be read as including a cylinder, roll, or the like.

What I claim is 1. A rigid doctor; or scraper for cleaning the surface of a rotating cylinder, said doctor having a continuous scraping edge adapted to lie in contact with the surface of the roller and having portions of said scraping edge adapted to engage the roller siinultanc' ously in planes parallel to the axis of the roller but eircuinferentially spaced apart, substantially as described.

2. A rigid doctoror scra )er for cleaning the surface pf ztrot'ating cylinder, said doctor having a continuous scraping edge adapted to lie in contact with the surface of the roller and having portions of said scraping edge adapted to engage the roller simultaneously in planes parallel to the axis of the roller but circumferentially spaced apart, together with other portions of said scraping edge engaging the surface of the cylinder and extending between said parallel portions of the edge, substantially as described.

3 A rigid doctor or scraper for cleaning the surface'of a rotating cylinder, said doctor having its blade grooved to afford a con the tinuous scraping edge adapted to lie in contact with the surface of the roller with portions of its scraping edge engaging the roller simultaneously in planes parallel to the axis of the roller but circumferentially spaced apart, substantially as described.

4. A rigid doctor or scraper for cleaning the surface of a rotating cylinder, said doctor having its blade grooved on both upper and lower faces to afford a continuous scraping edge adapted to liev in contact with the surface of the roller with portions of its scraping edge engaging the roller simultaneously in planes parallel to the axis of the roller but circumferentially spaced apart, substantially as described.

5. A rigid doctor or scraper for cleaning the surface of a rotating cylinder, said doctor having a continuous scraping edge adapted to lie in contact with the surface of the roller and having portions of said scraping edge adapted to engage the roller simultaneously in planesparallel to the axis of the a roller but circumferentially spaced apart, together with other portions of the scraping edge engaging the surface of the cylinder at an incline to the direction of rotation of the cylinder and extending between said parallel JAMES NUTTALL.

Witnesses ERNALD SIMPSON Mosnnny, MALCOLM SMn'rHURs'r. 

